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Chromium-free tanning agent and preparation method thereof

A chrome-free tanning agent and solvent technology, applied in the field of chrome-free tanning agent and its preparation, can solve the problems of ecological environment damage, complicated tanning process, limited chrome resources, etc. Effect

Active Publication Date: 2014-08-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main tanning agent currently used is trivalent chromium salt. Trivalent chromium salt tanning agent has the advantages of washing resistance, storage resistance, and good moisture and heat resistance. However, the global chromium resources are limited, and chromium is a heavy metal. The waste liquid and dander produced when using it to tan raw hides inevitably contain trivalent chromium. These chromium-containing wastes will inevitably cause damage to the ecological environment, and trivalent chromium is easily oxidized to generate hexavalent chromium during use. , so developing an environmentally friendly tanning agent with good tanning effect is the current research goal
The existing chrome-free tanning agents have disadvantages such as high price and complicated tanning process

Method used

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  • Chromium-free tanning agent and preparation method thereof
  • Chromium-free tanning agent and preparation method thereof
  • Chromium-free tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of chrome-free tanning agent, comprising the following steps:

[0029] Add 10 parts of sodium silicate to 100 parts of soft water, then add dropwise to the solution prepared by 10 parts of sulfuric acid, 10 parts of acetic acid, 5 parts of citric acid, 5 parts of lactic acid and 100 parts of water, and then add to the above The solution prepared by adding 50 parts of aluminum trichloride and 100 parts of water is added dropwise to the solution after the dropwise addition. After the dropwise addition is completed, the tanning agent solution is obtained. The tanning agent solution is spray-dried with an air volume of 80% and an air inlet temperature of 120°C. The feed rate is 10mL / min, and the chrome-free tanning agent product is obtained, which is stored dry, and the stated parts are parts by mass.

Embodiment 2

[0031] A preparation method of chrome-free tanning agent, comprising the following steps:

[0032] Add 10 parts of ethyl silicate to 100 parts of ethanol, and then dropwise into In the solution, then in the solution that above-mentioned dripping is finished, add the solution that 50 parts of aluminum trichlorides and 100 parts of waters are prepared drop by drop, promptly get tanning agent solution after dropping, the tanning agent solution is spray-dried air volume 80%, The air inlet temperature is 180°C, and the feed rate is 10mL / min, to obtain a chrome-free tanning agent product, which is stored in a dry place, and the stated parts are parts by mass.

Embodiment 3

[0034] A preparation method of chrome-free tanning agent, comprising the following steps:

[0035] Add 100 parts of sodium silicate to 50 parts of soft water, and then dropwise add it to the In the prepared solution, then add dropwise the solution prepared by 10 parts of aluminum trichloride and 20 parts of water to the solution that has been added dropwise. After the dropwise addition is completed, the tanning agent solution is obtained, and the tanning agent solution is spray-dried with an air volume of 100 %, the air inlet temperature is 120°C, and the feed rate is 10mL / min, and the chrome-free tanning agent product is obtained, which is stored dry, and the stated parts are parts by mass.

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PUM

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Abstract

Disclosed is a preparation method of a chromium-free tanning agent. The preparation method includes following steps: adding a mixed solution into a solution and carrying out an acidification reaction with stirring to prepare a silicic acid solution, wherein the mixed solution contains a silicon-containing compound and a solvent and the solution is a mixture of an inorganic acid, an organic acid and a solvent, dissolving an aluminium-containing compound and adding the aluminium-containing compound to the prepared silicic acid solution, carrying out a spray drying process to obtain a white powdery chromium-free tanning agent product and drying and preserving the product. The tanning agent is free of harmful substances such as hexavalent chromium, formaldehyde and the like, is excellent in environmental-friendly performance, is substantially harmless to human body, is simple and convenient in production process, is low in cost and is suitable for large-scale production. [0]

Description

technical field [0001] The invention relates to the technical field of preparation of leather chemicals, in particular to a chrome-free tanning agent and a preparation method thereof. Background technique [0002] Tanning is an important step in the process of turning raw hide into leather. The quality of the tanning process directly affects the physical and chemical properties of the finished leather, and has an important relationship with the value of the finished leather. The main tanning agent currently used is trivalent chromium salt. Trivalent chromium salt tanning agent has the advantages of washing resistance, storage resistance, and good moisture and heat resistance. However, the global chromium resources are limited, and chromium is a heavy metal. The waste liquid and dander produced when using it to tan raw hides inevitably contain trivalent chromium. These chromium-containing wastes will inevitably cause damage to the ecological environment, and trivalent chromiu...

Claims

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Application Information

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IPC IPC(8): C07F7/04C14C3/08
Inventor 张辉刘子龙王学川强西怀
Owner SHAANXI UNIV OF SCI & TECH
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